US2462262A - Dual spray gun - Google Patents

Description

56h 22, 1949. E. GusTAFssoN ET AL 2,462,262

' DUAL SPRAY GUN Filed Maron 9, 1944 4 sheets-sheet 1 FZ .j 39 \l L 5/ Z v Feb. 22, 1949. E. GUsTAFsSoN ET Al. 2,462,262

` DUAL SPRAY GUN Filed March 9, 1,944

4 Sheets-sheet 2 Feb. 22, 149o E. GusTAFssoN ET AL 2,462,262 y lDUAL SPRAY GUN Filed March 9, 1944 4 Sheets-Sheet 3 Feb 22, 1949. E. GusTAFssON ET Al. 2,462,262

DUAL SPRAY' GUN Filed March 9, 1944 4 Sheets-Sheet 4 EZ 46 -MJ Patented Feb. 22,1949

i jA her" sweeter 'trie intendente td'pri/idea fno el ay gun" deviewhayingplurali spray' gun "um en 'hvejindividai liquid controls whereffby one may, be madetolagthe other when open-` ing',"as Aby adjusting' the needle' valve guide"`and lock'riutlef each'iunit.

'further obj'e'ctiof vthe invention' is tofprovi'de lajr'ic'nvel' 'spiayv gun device' 'having'acommon' Aair w'supply means'acminonj air 'supply'controLI and "a" comm'orifliquid'supplyeontrol.

"Other objeets;"adv'antages,'capabilities, features and the like are comprehendedby'the invention fas will later* appear,and 'as' are inherently pos- "ses'sed by the invention.

*Referring to thefdrawings:

Fig. 1 is a sideview of an embodiment of the invention; y

Fig."2 is a transverse sectional view'taken in'a 'plane represent'f-:dl byline 2-2 in Fig. 1;

Fig. 3 is a top plan view of the same; Fig. 4 isa horizontal sectional View `taken in a i plane represented by line 4-'-4 in' Fig. 1;

'Fig' 5 is a vertical sectional view taken in a plane represented by line 5-5 in FigG 3; t

i Fig. 6 is a fragmentary horizontal sectional view takenin a plane represented by. lin 6-1-6'111" Fig. 1;

Fig. 'Tis a'horizontal sectional view, on' an enlarged scale, taken in a plane represented by line 6-6 'in Fig.1;

, Fig. ,8 is a forward end view of the liquid nozzle unit shown in Fig.` 9;

Fig, 9 is a view in side'elevation of the liquid nozzle unit;

Fig. 10 is' a rear end view of the liquid nozzle unit shown in Fig. 9;` and, Fig. 11 is a fragmentary vertical sectional View, taken in av plane represented by line I I-I I shown ,-in Fig. 7,-orin a plane represented .by lineI Ia--I la. shown in Fig. 4, with thenozzle unit, nozzle cap` and coupling omitted in both eases, and looking in the direction of the arrows in both cases.

Referring more in detail to the drawings, an embodiment chosen to illustrate the invention is shown as eomprising a body I having at its lrear "end a handle Zand at its forwardend a crosshead 3. The lfandle 2 i s proyided'with an air f p'assage 4 leadingfrom a hose connection 5 at the refe' having' plurarsprayijgun fisprov .ed shookiofby which-'che devieefmay be lianyiirrinigfge. fAtjthe upper-"peregrina i' the latter' liaving'suitable pakingffmeans/ I1. Qn .he valve s 'eainiiemberll l. nvrmillylsgts relie "element 1s savings valve-@66er Is--wnien @genas l thereofjfwith an eiidfj of? the spring` 2 I "pressing "fue *forward .elndoffesi/.alie Xteriorly lto be "contacted byf a :Sinti-verrier and being'piyotally`fconreeted-'to' pivdt studs juncture' of 4the heel; I6.

A'rhrfmghf an' intermediate portion" of thebjiy jl 'extends @guider/ay 21 rriigs; 5 vand '6) 'inwhieh 65j' trids .forwardly thmuehjhegair passage 1;' @iid a. packing'meansj-29 provided inthe forward' part Of the body I The rod I28 'c'arries a collarf'30 adapted to be jengagedby the upper end'of the press'er*p1ate "2 3. The rear en d of the Yroc l .28

has a` stem 3I which extends 'rearwardly through 'extends 'forwardthrough thev plate 23, 'thej'triggir f2wand;jsiidelyjina 'guide' bushing 3 3 threaded into a socket; 34' provided in 'therear 'portion 'of j the cross-head@ The rod 28'is provifdediatian [intermediate portion thereof 'with' a threaded part 35 on whichisfjadjustably'mountedja yke v36 backed' by -an adjusting nut'3'l 'threadedfn the threaded part`u35, as shown in Figs. 5 andvy.

' The body I hasa forwardly extending 'tubular socket 48, and both the tubular portion 38 and the socket 40 are threaded to receive a coupling thimble or bushing 4| threaded therein to hold the cross-head 3 and the head part 39 in firm abutting relation. The lower part of the head part 39 is provided with an aperture 42 in which ts the guide bushing 33, and also for holding the cross-head-3 and the head part 39 in fixed relation, that is, from turning about the axis of the bushing 4|. The bushing 4| is preferably provided with a non-circular, such as hexagonal,

bore 43 (Fig. 2), for the use of a tool toscrew the bushing 4| in place and for tightening the cross-head 3 and the head part 39 together. This bushing 4| preferably has oppositely pitched threads for drawing together, when it is turned in one direction, the cross-head 3 and ,the head part 39, and for separating them when the bushing is rotated in the opposite direction. In the cross-head 3 is provided a cross bore 44, which may be closed at its ends by suitable screw plugs 45 (Fig. 4), and which is in communication with thesocket 40 by reason of its intersecting the socket 4D, as shown in Fig, 5.

Each end of the cross-head 3 is provided with y, `aforwardly extending socket 46 provided with an internally threaded portion 41 (see Fig. 1) for the engagement of a, rear threaded end portion 48 of a nozzle unit 49, which sockets 45 are forwardly converging. The unit 49 has a longitudinally extending liquid passage 50, a forward tapered nozzle part 5| with an orifice tip 52 controlled by a valve tip 53 of a needle valve 54, and has at its rearq end a tubular portion 55 provided with a tapered seating portion 56 to seat at the forward end of a liquid passage 51 pro vided in an end portion of the cross-head 3, as best shown in Fig. 7. The needle valve 54 extends through the passage 51 and rearwardly through and exteriorly of a packing means provided at the rear portion of the end portion of the cross-head 3, the packing means comprising a plug 58 screwed into said end portion of the cross-head 3, a packing 59 and a gland 60. The rear end portion of the needle valve stem 54 is threaded for adjustable connection with anut part 6| from a reduced forward end portion of a. tubular plunger 62 extending into a spring socket 63. See also Fig. 4. The member 63 has a: forwardly extending bracket 64 forming -a rigid part of the head of the packing plug 58. See Fig. 1. The needle valve stern 54 extends into the socket 63, as shown in Fig. 4, and is surrounded by a spring 65 bearing at' its forward'end against the rear end of the Vplunger 62 and at its rear end against a plug 66 screwed in the rear end of the socket 63. The'plug 66 has a vent hole 61, as shown in Fig. 4. Each end of the yoke 36 has a fork 68 (see Fig. 2) for spanning the nut part 6| and for abutting against the forward end of the plunger 62. By adjusting the nut 6| with the plunger 62 on the threaded portion of the valve stem 54 the plunger 62 may be pressed more or less against the spring 65 and held with more or less space between the forward end of the plunger 62 and the fork 68 to govern the time of opening of the needle valve tip 53 when vthe yoke 36 is moved back by a manual pull on the trigger 25. In this way the spraying of the liquid may be effected from one of the spray nozzles ahead of the other.

The nozzle unit 49 has spaced annular or ring seating portions 69, 1U andl1| for seating respectively on seating portions 12, 13 and 14, of which seating part 12 is at the forward end of 4 the socket 46, and the seating parts 13 and 14 are spaced parts of a nozzle cap 15. A suitable coupling ring 16 is connected to the cap 15 and the socket 46.

The nozzle unit 49 is also provided with air passages 11 leading to a forward chamber 18 provided between the forward end of the nozzle unit 49 and the frontal Wall of the air caxp 15,4

and to an air oriiice'19 in the cap 15. At the rear end of the nozzle unit 49 and in the crosshead 3 is provided an annular air passage 89 for communicating with the air passages 11. The air passage communicates (see Fig. 11) with a valve chamber 8| which in turn communicates with the air passage 44.

From the liquid passage 51 extends, downwardly, a passage 82 in which is screwed a tting 83, see Figs. 2, 6, and 7.

From the chamber 8| (see Fig. 11) runs a passage 84 to an annular passage 85 provided in the forward end of the socket 46. The passage 84 is controlled by a valve. 86 having a stem 81 threaded in a plug 88 in turn threaded into the upper part of the cross-head 3. The upper end of the stem 81 has a head 89. The stem 81 has a cross-pin 90 for supporting a washer 9| against an end of a spring 92 provided in a. socket 93, provided in the plug 88. The spring 92 aids in the closing of the valve 86 on its seat.

The nozzle unit 49 has air ducts 94 which lead from the air channel 85 to an air channel 95 provided between the unit 49 and the air cap 15, and in the air cap 15 are provided air ducts 96 extending from the channel and through horns 91 to side ports or orifices 98, for the projection 40 pressing back the trigger 25. This first causes the air ,valve- I8 to open and air under pressure flows by way of the passages 4, 1, and 8, bore 43, socket 46, to cross bore 44 (in both directions), thence by way of valve chambers 8|, air passages 80, air passages 11, air chambers 18, and air orices 19. The air is projected ahead of the liquid. With the side port valves 86-81 open, air also passes from the valve chambers 8| by way of the passages 84, 85, 94, 95 and 96 to side jet orifices 98. f

Further movements of the trigger 25 will cause it to engage the collar 3U on the rod 28 to move back the yoke 36. 'Ihe bifurcations or forks 68 of the yoke 36 will then engage the tubular plungers 62 to move them rearwardly and, hence, the needle valves 54 to open up the liquid orifices in the tips 52 whereby the liquid is projected in a solid stream. The air from the orifices 19 will aerate the liquid streams, and the side jets of air from the orifices 98 will hit these streams and flatten them, as is Well known in the art.

The liquid flows by way of hose connections 83 to passages 82, 51 and 50 to the nozzle tips 52.

When it is desired that the liquid to one of the spray nozzles 49 move subsequently to that of the other nozzle the tubular plunger 62 of the former may be adjusted back, by the adjusting nut 6| being screwed or set back on the threaded part of the needle valve 54 (see Fig. 4) s'o that when the yoke 36 is moved back, it will engage the plunger 62 (see lower part Fig. 6) later than the plunger 62 of the other spray gun unit (see upper part Fig. 6). The converse may be effected as is obvious from the above description.

Releasing the trigger 25 will cause iirst a shutting off of the liquid and then of the air.

While we have herein described and upon the drawings shown an illustrative embodiment of the invention it is to be understood that the invention is not limited thereto but comprehends other constructions, details, arrangements of parts, features and the like without departing from the spirit of the invention.

Having thus disclosed the invention, we claim:

1. In a dual type of spray gun, a gun body, a pair of spray nozzles supported on the gun body, a pair of needle valves to control the spray from the nozzles, spring means normally closing said Valves, a yoke connected at its opposite ends to the needle valves so that when the yoke is moved in one direction the needle valves will open and when it is moved in the opposite Ldirection said valves will be closed by their respective springs, a guide member, means on the gun body to mount the guide member so that it may reciprocate,I

said yoke being rigidly but adiustably connected to the guide member so as to reciprocate therewith, and means movably supported on the gun body and adapted to engage the guide member to move the same to effect opening of said needle valves.

2. In a dual type of Ispray gun, a gun body, a pair of spray nozzles supported on the gun body, a pair of reciprocable needle valves to control the spray from the nozzles, said needle valves having stems extending outside the nozzles, spring means acting to normally close said valves, a yoke connected at its opposite ends to the needle valves so that when the yoke is moved in one direction the needle valves will open and when it is moved in the opposite direction the needle valves will be closed by their respective springs, a guide member slidably mounted on the gun body, means rigidly but adjustably connecting the yoke at its center to the guide member so that the yoke will move with the guide member, means movably supported on the gun body and adapted to engage the guide member to move the same to effect opening of said needle valves, and means including a nut threaded on the stem of each needle valve and having a plunger engaged by one of said springs to increase or decrease the pressure with which the needle valve is held closed, said nut having a shoulder adapted to be engaged by the yoke end when the yoke is moved to valve-opening position, the position of each nut on its stem being variable to permit the opening of either one of the needle valves before the other.

3. In a dual type of spray gun, a gun body, a pair of spray nozzles supported on the gun body, a pair of needle valves to control the spray from the nozzles, said needle valves having stems extending outside the nozzles, spring means acting to normally close said valves, a yoke connected at its opposite ends to the needle valve stems, a guide member slidably mounted on the gun body,

means securing the yoke at its center to the guide4 member so that the yoke may reciprocate with the guide member, means to deliver fluent material to each of the nozzles past the needle valves, the gun body having air passages therein leading to the nozzles, an air valve in the gun body for controlling the flow of air to the nozzles, and means movably supported on the gun body and adapted to engage the guide member to move the same to effect opening of said needle valves, the air valve having a part which is engaged by said last mentioned means to eiect opening of said air valve prior to the opening of said needle valves.

4. In a dual type of spray gun, a gun body, a pair of spraynozzles on the gun body, a pair of reciprocable needle valves for controlling the spray nozzles and having stems extending outside the spray nozzles, a guide member slidably mounted on the gun body, a yoke secured by screw threads at its central portion to the guide member, the ends of the yoke embracing or straddling the two valve stems, a nut threaded on each valve stem, a pair of spring sockets secured to the gun body, each spring socket being aligned with one of the valve stems and housing the outer end of the same, a -coil spring within each spring socket surrounding the valve stem, a plunger secured to each nut and movable into the spring socket against the resistance of the coil spring therein, said plunger providing a shoulder at the end where it is secured to the nut, said shoulder being engageable by the yoke, and means on the gun body to move the guide member and the yoke so as to cause said plungers to compress the coil springs and move the valve stems to open said needle valves.

ERIC GUSTAFSSON. HAROLD L. STRIEGEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name v Date 308,507 Maxwell Nov. 25, 1884 868,023 Simpson Oct. l5, 1907 1,559,790 Schneider Nov. 3, 1925 1,819,117 Preble et al Aug. 18, 1931 1,910,673 Bramsen May 23, 1933 1,950,779 Bramsen Mar. 13, 1934 2,107,726 Bramsen et al Feb. 8, 1938 2,249,205 Hansen July 15, 1941 2,249,771 MacMartin July 22, 1941 2,255,189 Robinson et al. s Sept. 9, 1941 2,265,209 Thompson Dec. 9, 1941 2,380,827 Downs July 31, 1945

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